Process of manufacturing iron and steel.



UNITED STATES, ,lATENT OFFICE;

J'EGOR ISRAEL BRONN; OF ROMBACH. GERMANY, ASSIGNOR OF ONE-HALFTO THE F131; ROMBACHER HUTTENWERKE, OF ROMBACH, GERMANY.

12333970.- No Draining.-

at Romhach, in Lothringeu, Germany, have oxygen partly in the form ofiron oxygen combinations such as proto'xid of iron which niust he sub'ected to some deoxidation proccss before-t e metal can .be, usedxior in(lns t'rihljiaurposes. The ob ect of this invention is toefiectlvely and c eaply produce deOxidat-ion of oxygen "T"c'ontaining iron baths. To this end the oxygen'conta'ming iron baths obtamed in one of iron nnd steel are treated according to the in ientijoniwith phosphorus containing iron When the phosphorus pi iron used is just sufiicient to react with t e oxygen ofthe.

de'r certain conditions it may he fadvisuble to calculate the quantity of the phosphorus containing iron for treating the oxygencontaining loathin such a manner that its amount somewhat exceeds the quantity ;which is necessary for deoxidation of the phorus enters the iron bath. Such a smell amount of phosphorus in the bath, then 'practicnlly free of oxygen, can easily be short duration' without appreciably deteof such a substancclas ferro-manganese is not vxcludcd, by the use of this invention and it may he added when it ieiicsirable to obtain an iron and steel product containing di-liniie amount of manganese.

When this invention is usedin connection 55 with the manufacture of iron and steel ac- Specification of Letters Patent.

'a citizen of Empire of Germany, 'residing 6 invented certain new and useful Improve process contain a considerable amount of.

E thesaid'known processes for manufacturing such as phosphorus pigliron, used as raw. mi terial in the so called Thomas. process.

80 hath and produce the deoxidatiomno substantial impurification of the. bath results Un- Iron bath so that a ver Y small amount of plies removed again by a refining process of riorating the bath, as. far 'as the oxygen, 45

PROCESS OF MANUFACTURING IRON AND STEEL.

Patented July 17, 1917-,

' Application filed April 24, 1917. Serial No. 164,274.

cording: -to the so t-allcrlThoniasfprocess" within the converter then I prc forllo, pi'o cecd as follows: The coni'cr ttir is fedin the usual manner \iith phosphorus pig iron and blown as usual i order tori-fine the metal on till the phosphorus of the bath is substantially removed and the bath enriched with F oxy en. lierea fter the supernatant layer of sing is rclm'n'cd and then :nradditior. ot molten phosphorus containing pig iron for instance, Thomas pig iron of the same qlu'ih is made, a quantity of about-600 kg.'o Thomas pigiron being under ordinary ,coll': ditions sufiicient' for a converter con toinlng about 22 tons molten iron, This nddition of pig iron allowed to react witli the molten bath .and the bath then poured into ingot molds 'as usual. If it is intended to raise the contcntsof the finished metal in manganese then a suitable quantity of form'- manganese or other'suitahle manganese containin iron-maybe mixed wviththe liquid iron 0 the convertereitherwithin the con- .verter'itself or within the ingot mold. The deoxidizing effect of the addition of Thomas pig iron to the converter charge ,appoars from the following comparative, I .data relating to working with Thomas pig iron containing 0.45% silicon, 1.20% mangan.ese, 1.85f", phosphorus and 3.5% carbon;

Iron both within the ('on-, i

vcrtcr before mlflitlon v 1 of or iron e- 0.10% Mn n,o4 5%'r 0.05%c nth-after mlditlon I 4. of Thomas plg iron-" 0.25% Mn 0.085% P, 0.97% C o- It is advisable to add the phosphorus con taining pig iron to the converter bath in liquid condition in order to improve the in-- tor-mixing and the reaction of theplumphorus of the pig iron addition with the oxv en of the bath. i e molten Thomas pig iron to be added,- to' the converter bath may be taken from a.- pig iron mixer. However, I prefer to trike it from a suitable smaller receptacle p'rovided with some healing device and fed with Thomas pig iron from the iron mixer.

A modification of this process consists V/therein that the molten Thomas pig, iron used for deoxidation is intrmluccd into the ingot mold so that inter-mixing lwtivceu this dooxidizing agent and witl'rthe metal of the ba h takes place on pouring; the bath into the ingotmol'l Another modification of the process 05110 the phosphorus from the hath up to the de sired degree of retiuiu". In this ease for instant-e l'itlt) kg. of ltllfllllilh' pi; raw iron may he added to a eonver'trr eharge ot tons.

15 The. eli'eet, ol the process aeeording to this embodiment almears t'rom'the following eomparatn e data (onrerter hath (:(Ll'nns) 0 [his remarkahlr that the hath al'ter addition of-the. lfltlttkg. of 'lholu as pig iron eontained more manganese than the sum of that; remained in" the hatlr al'ter blowing andfthat. in the lLflOkg. of added pig iron.

on: 'lhe"2() tons-pig iron eontained a l ter trhlowiiig 0.171}? or lt kg. manganese. the lilitlt) kg. addedtpi iron eontainin; 1.20%. lnangane. l-l."l kg. manganese, therefore the. hatli and the added pi; iron eontaln together'lrL-l kgltnangzanese. The analysis of the, hath, howl-rm; showed as stated 0323']. imangianese. This makes on it ltltl kg. L]- kg. manganese. 'lhe protoxid of manganesetherefore has heen partly reintrodueed into the. hath as metallie manganese.

in ronneetion with the open hearth 'l'nrnaee proress the hath is refined-as usual and the. iron rieh in phosphorus l'or nistanee. 'l'hoinzrspi; iron or l'erro-phospluurns. added prelferahiy in molten 'eondition when the t'urnaee ehargeis nearly finished. (are is to he. takenthat the'slagI-la 'er on the iron bath is not. very high in phosphorus and tliat. it is in as'lliin liquid eomlition as possible.

The following: eoniparatire data show the ell'eet. ol' the addition of 'lhomas pig iron 'lhe l'urlmee elmrzz (3221 tons) after relinlln: I'ultfl'llu'll .lfi'fn MI! ".":,':1! l' ulog;

1 tamed m the pl; Iron addition. namely:

The hath enutainml -a .\Inl the addition flfi lu-reas the hath routnined as flllUYt stated This a Dittll'ri.fl'fllll-dllt following ealeula- I in t-lllh way the additions of phosphorus and. manganese would he eomlnnedJ-to"one single 'steel ronsisting-in preparing. an iron bath of.

-of the impurities and treating theliath oAy-.

HIV '4 manganese or l-tH kg, so thaban inerease ol' IhLl kg. manganese has taken plaee. 'lhe phosphorus on the contrary shows a eonsit'lerahle deerease. namely:

'lhi makes togrlhel' -7 g whereas the hath contained Ji-taiXtLOGlZzillB kg so that a deerease in phosphorus of 30.4 kg. has taken plaee whieh hare lieen'nsecl for deoxidizing purposes.

'lhese dat'a relate to the pigiron ore process. himila r results are'ohtained in connection with the. pig iron serap )roccss. If eompared with the usual deoxit at-i'on processnith 'l'erro-mzmganese alone tllG.(l00Xidation with pig iron (Thomas p'igiiron) rieh lli phosphorus results in saving 3. k". metallie manganese or '4 kg. ferro-i.n:uiga nese. with .3036. of manganese for each ton of steel. 3

ll desired the small quantities of'mangar. nese whieh it is eventually intcndet to in eorpol'ate in the iron.hatlr'ezm-he rated in the deoxidizing pig ironsot :i 'lhomaspig iron rich in mang'an'es is ol tained or from 'lerro-phosphol'ils, form. phosphorus material rieh "in" manganese.

additional material.

What]. elann is; l l. lroeess for manufacturing iron mm} impure iron, refining the same hy'oxitla-tion' genated during the refining-process with a phosphorus eont'aining iron niaterial to deoxidivle the same. I I 1 05 '3. iroeess-t'or mannfaetnring iron and. stetl eonsist'ing in preparing an iron bath .of impure iron. refining the same by oxidathm ol' the impurities and deo'xitlizing the metal ol' the hath oxygenated {hiring the refining proeess with a quantity of phosphorus contaiiiing iron material whieh'is small .in comparison with the. quantity of the metal -of the hath.

:i. lroeess for nnnmfaetnrin iron and steel eou'sisting in preparing an iron bath of; impure iron. relining the same by oxidation of the impurities. rout-inning the refining proeess till. the lmtli.is oxygenated, removin; slag from the lmlhpresent; during the refining pn eess and tit-oxidizing the bath with iron material'rieh in phosphorus-in a.- quantity whieh is small in eomparison with the quantity ol' the met-at of the. bath.

I. lroeess l'or mamlfaeturing iron and steel "insisting in preparing an iron bath of il |||Htl'e iron. relining the same hy oxidation of .the impurities, eontinuing the refining proeess till the hath is ox \'genatetl. and (leoxidizing the hath with iron material rieh in fipiteining iron baths with phosphorus in a cpiantity which is small in comparison with t 1e quantity of the metal of the both, however exceeding the uantity neeessn to efiect deoxidntion of t e bath by reaction of the phos horus with the oxy: gem of the bath and telling up the refining operation for a. short period.

- 5. In zr process for manufacturing iron and steel the step of deoxidizing oxygen iron material h in phosphorus. i 6. Process for manufacturing iron and consisting Preparing Phosphorus continuing such pig iron containing iron 7 bath, refining the some soils n: oxiime the impurities therein, refinm phosphorus of the bath is substantially resome so as to oxidize the impurities therein,

moved and the iron bath oxygenated and then treo-ting the-molten iron with a, cornparptively smell gonltleining iron sufficient to deoxidize the at a '1 I v 7. Process for manufacturing iron and.

steel consisting in preparinge phosphorus pig ironconteining iron. bath, refining the continuing such refinin process till the phosphorus of the bath is substantially removed and the iron bath oxygenated and then treating themolten iron with a com rativelysnrall proportion of a so called home, pig iron material containing be and the bath oxy eneted, removing procem till theproportion of phosphorus sides phosphorus manganese the entity of such material being so calculate that it is suflicient to deoxidize the birth.

8. Process for manufacturing iron and steel consisting in prepermi a phosphorus pig iron containing both wit in a converter, subjectin% the same to blowing in order to oxidize tie impurities therein, continuing the blowing operation till the phosphorus of the bath is sul'istnntinlly removed the sin from the bath ad ing a comparatively sum 1 proportion of phosp orus containing molten Thomas pig iron exceeding somewhat the quantity which is necessary for deoxidetion of the bath and renewingthe blowlng open ation for a few seconds to oxidize the small phosphorus-content again present within the 9. Proeem for menufncturin g iron and steel consisting in preparing an iron bath of ,impure iron, refinm the same by oxidation of the'impurities en treating the bath on? 55 genated during the refining period, as it is poured, with a phosphorus containing iron material to deoxidize the same. In testimon whereof I afiix my signat in presence 0 two witnesses. I

' JEGOR ISRAEL BRONN. Witnesses: x i

In; Ammrmn Bronx,

W. SJSrnnennunno. 

